Generations of dark hollow beams and their applications in laser cooling of atoms and all optical-type bose-einstein condensation

摘要

We report on a new experimental results to generate dark hollow beams by using a geometric optical method. We propose two new methods to produce focused and localized hollow laser beams by using π-phase plates. Using Monte-Carlo simulations, we have studied the sisyphus cooling of alkali atoms in pyramidal hollow beam gravito-optical traps. we discuss some potential applications of the dark hollow beams in atom optics and the preparation of an all optically-cooled and optically-trapped atomic Bose-Einstein condensation (BEC).